js月末月初问题

function getNextMonthFirstDay(date) {
  let nextMonth = new Date(date);
  nextMonth.setMonth(nextMonth.getMonth() + 1);
  nextMonth.setDate(1);
  return nextMonth;
}

let today = new Date();
let nextMonthFirstDay = getNextMonthFirstDay(today);
console.log(nextMonthFirstDay);

function isEndOfMonth(date) {
  let nextDay = new Date(date);
  nextDay.setDate(nextDay.getDate() + 1);
  return nextDay.getMonth() !== date.getMonth();
}

let today = new Date();
console.log(isEndOfMonth(today));